Operating mechanism for gear-cutting machines.



J. BUCK.

OPERATING MECHANISIVI FOB GEAR GUTTINGKMACHINES. APPLICATION FILED FEB. 2. |915.'

1,163,503. Patented Dec. 7, 1915.

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cnLuMBIA PLANoaRAPH co.. wAsHfNGTCINy D. C.

roHN BUCK, or LINCOLN, ENGLAND.

OPERATING MECI-IANISM FOR GEAR-CUTTING MACHINES.

Specification of Letters Patent.

patented Dec. 7, i915.

Application led February 2, 1915. Serial No.`5,734.

To all t0/wm it may concern Be it known that I, JOHN BUCK, a subject of the King of Great Britain, residing at Lincoln, England, have invented certain new and useful Improvements in Operating Mechanism for Gear-Cutting Machines, of which the following is a specification.

The present invention relates to mechanical movements, and particularly to a construction of improved appliance for use in connection with bars, rods, plates, levers, or the like, which are suitably arranged to be moved in unison, and preferably, with a movement relative to each other, and capable of actuating other mechanism, or causine" a. definite action'or seriesof actions of said mechanism.

It is the object of this invention to produce means whereby the bars, rods, plates, levers, or the like, are balanced in all positions they may occupy land during their operation, so that the work which is effected bv said operation is done with the greatest possible accuracy and evenness without fear of slip or disconformity and without the use of weights` pulleys, coil springs, or the like contrivances heretofore used.

For the purpose of this invention. the latter will be described and illustrated as for use in connection with mv bevel wheel' cuttine' machine shown and described in my British Patent No. 22,132 of 1913, and in mv United States application Serial No. 817.030, filed February 6. 1914. but it is to be understood that the present invention for balancing the moving parts can be applied ta other classes of machines in which a similar to and fro movement of two elements hinged or pivoted together` or to another appliance. is reouired to perform a definite action or series of actions of mechanism connicted with said elements while the elements are at rest.

The in"ention further consists in a certain construction` arrangement and combination of parts hereinafter more fully described and finally pointed out in the appended claims.

Figure 1 is a side elevation of one form of the invention as applied to a portion of the machine set forth in the above-mentioned patent. Fig. 2 is an end view of Fig. l. Fil. 3 is a view similar torFiQ'. 1` however. illustrating a slightly modified construction of the present invention.

In carrying my invention into practice,

means are provided for balancing the tWo backing or grooved plates carrying the cutter slides and holding them in the position placed by the slots of the formers engaging the tracer pins of the adjustable pieces upon the back of the lgrooved plates. The said means consist, as shown in Fig. l, of the two rods or bars a, and b pivoted to each of the two back or grooved plates 8, said rods having their opposite ends pivotedly connected to the opposite ends of a rockinglever c pivotedly mounted and supported intermediate its ends, and preferably at its center, to an arm or post l secured to the frame 25 of the machine, or to some suitable fixed part thereof. The rod fr is considerably longer than the rod Z) and is pivoted to the backing plate 8 farthest away from the post cl, both rods may be screw-threaded in ka socket, as shown at e, however, as here shown, the rod a 'is connected with the socket e, which latter is pivotedly connected with the opposite end of the lever c. The socket e, together with the nut e', permit a longitir dinal adjustment of the rod or the distance between the pivot points f and g to be varied to suit the position of the rocking lever 0 and the post d, the rocking lever c normally lying at substantially right angles to the rods a and b.

By the abo-ve construction of levers, a perfect balance of the back or grooved plates 8 can be had and thus keep the tracers 20 in proper Contact with their respective patterns l5 without the use of heavy weights, pulleys or springs, and consequently, effecting the work to be done with great accuracy and evenness and minimizing a possible imperfect operation of the cutting mechanism.

In order to obtain perfect synchronization of the moving bodies, such as the parts 8, the post or arm d. carrying the rocker lever c, may be formed with the horizontal eXtensions it having their ends provided with the vertical extensions i. The extensions t' are formed with the substantially vertical and relatively converging slots y' and the ends of the rocking lever c are formed with the slots r which are arranged at substantially right angles to the slots ,7' and approximate in position with said latter slots 7' formed in the extensions i. The pivot pins Z of the rods c and b pass through the slots 7c and the vertical or diagonalslots .7', thereby upon movement of the rocking lever c, the pivot pins Z, or their equivalent in the rods a llO and b, will ride along the slots lo of the rocking lever c and along the slots j of the extension z' of the post d. Thus, the rods will partake of equal vertical movements at their ends and, consequently, effect the obtainment lffda perfect synchronization of the moving o les.

The pivot pins Ziof the `rods a and b may t,

be positioned in guide blocks which may be fitted in the slots to give them a larger bearn ing surface.

Thefpost d carrvingthe rocker lever @may y be fitted below the moving bodies, as is shown in the drawings, in which case, the

weights on the connecting levers are in compression, or, if desired, the post CZ may be mounted above the moving bodies, in this case, the levers are in tension.

Only one half of the pattern l5 may be employed, if desired.

Having'thus described my invention, it is believed that a full and cle-ar understanding of the same may be had, however, it is to be understood that certain changes as to the precise construction, combination and arrangement of parts may be resorted to that fally within the legitimate scope of the append'ed claims.V

Copies of :this patent may be obtained for bar connected with each respective part, a projection on each bar and adapted to be loosely received in the slots in the opposite ends ofthe lever, guides arranged adjacent the endsof said lever and-extending in a direction substantially at right angles to Said slots, rthe projection extending into the said slots being adapted to extend into and be guided by the adjacent guide, substantially as described.

2.7Th'e combination with two parts of an operating mechanism, adapted to move together in unison and with a movement relative to each other, of a supporting post, a lever centrally pivoted on said supporting post and formed with slots in its opposite ends and extending longitudi nally thereof, extensions formed on said post and formed in the ends thereof with guide slots approximating each of the slots of said` tially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing v vitnesses.

t JOHN BUCK.

l/Vitnesses T. W. ROSE,

J. WrLKrNsoN.

ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

said parts beingv 

